Weighing scale



July 1-5, 1924.

E. C. ROWE ET AL WEIGHING SCALE original Filed sept. 29j 1921 PatentedJuly r15, 1924.

YU.Nl'illEtD STATES PATENT OFFICE.

EDGAR-C. ROWE AND ADOLIPH NIGER, F CHICAGO, ILLINOIS, ASSIGNORS TOMASON, DAVIS &COM^PANY, OF CHICAGO, "ILLINOIS, A CORPORATION .OF MAINE.

Wmo-KING SCALE.

Original application filed September 129 1921,?Seria1'No. 504,146.Divided and .this application led March :18, :1922. Serial No. 544,757.

To all whom 25 may concmm:

Be it known that we, EneARC. Rows and ADoLrH Morin, both citizens ofAthe United States, and both residing at Chicago, Cook County, Illinois,have invented certain new and useful .Improvements `in Ieigfhing Scales,of which the following is -a specification.

This invention has to do with'certain iinprovements in the constructionof weighing scales and the like. The 1invention -has referenceparticularly to the arrangement ofthe knife edge supports for .certainofthe weighing beams and similar parts through which the weighing forces.must be itransmitted with accuracy and as 4little friction :as-possible.

One of the objects of -the invention 4is to provide a knife edge support-of such arrangement that the knife edge and the surface against whichit bears will be lat 4all times held in proper `co-operative registry.In this connection, another object is to providean arrangement such thatin those cases in which the .cofoperative engagement is Vbetween aknife-edge and lan'eye, or eyelet, the parts will be retained againstendwise displacement from each other.

In connection with the foregoing, a further object of the invention isto provide in devices of this Vkind va guard which may be readilyattached` to oneolf'thefbeamsor elements, and which when in place willco-opcrate therewith and with the knife edge itself in sucha-manner asto prevent-the afores said displacement from taking place. In connectionwith the foregoing, a further object is to provide aA construction suchthat the aforesaid guard, when used, may be readily adjusted to the beamby the use of a single screw or pin, but which guard when so attachedwill be securely held and will be retained against twisting or similarangular displacement.

A further object of the invention is to provide a construction whichshall be very simple in form and very inexpensive to manufacture andassemble.

Other objects and uses of the invention will appear from a detaileddescription of the same, which consists in the features of constructionand combinations of parts hereinafter described and claimed.

In the drawing:

Figure 1 vshows a vertical section through a weighing :scale which isprovided with knife .edges and guardsl of the general form to which thisinvention relates;

F ig. 2 shows a detailed side view of the knife edge and guard onenlarged scale as compared tov Fig. 1; and

Fig. 3 shows an end view corresponding t0 Fig. V2. c

We will first state that this application is a division'of ourco-pending application for Letters Patent of the United States onimprovements in weighing scales, Serial No. 504,146, which was filedSeptember 29, 1921. In that application there'is disclosed aconstruction of weighing scale including a box like structure Lhavingthe base section el. and the upright back section 5. The base sectionvcarries a weighing pan which is sup ported on levers includingthelevers 6 and 7 from which the weighing forces are ultimatelyytransmitted toa lever 8 whose rear end connects by suitable links 9 and10 with a weighing beam 11. Said weighing beam is in turn supported byknife edges 12 from a bracket '13 in the upper portion of the uprightsection 5 of the box like structure. For the purposes of the presentinvention, we do not consider it necessary to describe the constructionindetail beyond pointing out that they include knife edges such as are:typically shown at 111 and 15 in Fig. 1.

Considering Figs. 2 and 3, we have `there- -in designated one of thebeams by the numeral 16. It is provided with a transversely extending`knife edge l17 which projects to one sidefof the beam V16 a sufficientdistance to receive a co-operfating surface Lbearing member. It alsopreferably projects to the other side of the beam 16 a slight distance,as shown in Fig. 2, in order to establish a lug with which the guard,presently to be described, may operate, although such projection is notnecessary in many instances.

The knife edge 17 may be secured to or Ywithin the beam 16 in anyconvenient manner, but in many cases it will be found satisfactory tocast the knife edge into the material of the beam itself at the time the'beant is molded.

In the construction illustrated, the knife edge faces downwardly. Inthis construction alsorthe supporting portion of the knife edgeoperates'with an eyelet 18 through Which the knifel edge extends, whicheyelet v*is provided with a'perforated lug 19 by means of Which it maybe supported, as from a bracket 20 by means of a ring 21,.as shown in Fig. 1. The eyelet 18 is of sufficient size to allow the knife edgeV tomove about freely and in such a manner that the knife edge makes contactonly ona line of contact.

In order to retain the knife edge in proper Yengagement with the partWith which it is intended to cooperate,'inthe form shown in the drawing,the eyelet, We have provided a guard 22. This guard comprises a U-shaped strip of metal having the upturned arms 23 and 211. The guard isheld in position With respect to the beam 16 in any suitable manner asby means of a pin or screw 25. Thearm 23 overlies the end Vof the knifeedge 17 and closely engages the same so` that the eyelet 18 is preventedfrom becoming 25 as a pivot. In this Way, the arm 23 is maintained inproper registry with the end ofthe knife edge. The guard might also beclearly retained against pivoting on the pin 25'by tightening up saidpinto a sufficient degree. The presence ofthe arm 24 will then preventsuch pivoting movementV r even in case the pin should become loosenedvThe upper portion of the armV 2e is Y. notched as shown in Fig. 3 at thepoint 26,

said notch engaging the projecting portion 2'7 of the knife edge. Ihensuch a lconstruction as the foregoing is used,Y the bracket 22 isfurther retained against swivelf Y ing on the pin 25 evenWithout'thenecessity ofthe'arm 24 maintaining close and snug contactwith the side face of the beam" 16.

It'Will be understood that inthe drawing of the present case We haveillustratedthe* The arm 24 is intended toflie snugly guard constructionas being incorporated Within an arrangement in which the knife edgeco-operates .vith an eyelet, but mani festly any other Ysuitable form ofco-operative element might-'be usedkin place of the eyelet, the guard insuch case also preventing the element fromV disengaging from the knifeedge in'an endvvisedirection. Nevertheless, We Wish to call attention tothe fact that the features of the present invention are hereinillustrated as being used Within a construction of scales Which isintended to be folded up and is of such forni and size that it can beconveniently carried from place to place. In a scale of this type, thereis added tendency for the parts to become disengaged from each other andtherefore there is a special benefit to be had in the use of the guardof the present invention for keeping the parts together in this type ofscale construction.Y

IVe claim:

1. In a Weighing scale the combination of a beam, an inverted knife edgeextending through said beam and `projecting therefrom at both sides, aloop member through which said knife edge extends, and a shaped clippassing beneath'and secured to the beam at a point beneath the knifeedge, one end of said clip overlying the end of the knife edgeimmediately beyond the position Yof the loop member to retain the loopmemberV in position on the knife edge and the y other end of said clipbeing in engagement with the knife edge adjacent to the opposite faceofthe beam, substantially as described.

2. In a Weighing scale thecombination of a beam, a'knife edge extendingthrough said beam and projecting beyond the beam, V a loop memberthroughWhichsaid knife edge projects, and a Uv-shaped clip secured to the Ybeam opposite to the knife edge, one end of said clip being inengagement with the end ofthe knife edge immediately beyond theYyposition of the loop member and the otherV end of the clip being'inengagement with the `opposite face of the beam,substantially asdescribed` i 1 EDGAR o. Rovvn. ADoLrH Mone.

